137967491 has 2 divisors, whose sum is σ = 137967492. Its totient is φ = 137967490.

The previous prime is 137967481. The next prime is 137967499. The reversal of 137967491 is 194769731.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137967491 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137967499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68983745 + 68983746.

It is an arithmetic number, because the mean of its divisors is an integer number (68983746).

Almost surely, 2^137967491 is an apocalyptic number.

137967491 is a deficient number, since it is larger than the sum of its proper divisors (1).

137967491 is an equidigital number, since it uses as much as digits as its factorization.

137967491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 137967491 is about 11745.9563680443. The cubic root of 137967491 is about 516.7243435207.

The spelling of 137967491 in words is "one hundred thirty-seven million, nine hundred sixty-seven thousand, four hundred ninety-one".